Cutting link for coal-cutting chains



- c. N. BARTON CUTTING LINK FOR COAL CUTTING CHAINS Filed Dec. 15 1919 B5 I H U, WWW/#1952720,

Patent Oct. 2, 1923.

FF 311E.

CHARLES N. BARTON, OF INDIANAPOLIS, INDIANA.

CUTTING LINK FOR COAL-CUTTING CHAINS.

Application filed December 15, 1919. Serial No. 344,841.

To all whom it may concern Be 1t known that I, CHARLES N. BARTON,

A a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented a certain new and useful Improvement in Cutting Links for C oal-Cutting Chains, of which the following is a specification.

My invention relates to improvements in cutting links for coal cutting chains, and has for one object to provide new and improved means for locking the cutting bit a into position in the bit carrying link of the chain. Another object is to provide means for locking the bit into position which will be immediately released when the holding pressure is released so that the bit itself may be readily withdrawn. Another object is to provide a single means for selectively tightening up and settin the bit holding wedge or releasing the wedge so as to permit free withdrawal of the bit.

My invention is illustrated more or less diagrammatically in accompanying drawings, wherein:

Figure 1 is a longitudinal sketch of a cutting bit link.

Figure 2 is a sketch along the line 2-2 of Figure 1.

Figure 3 is a side elevation.

Figure 4 is an end elevation of my improved form of locking wedge.

Like parts are indicated by like characters. 'A is a bit holding link adapted to form a part of a coal cutting chain and will be pivoted in that chain by means of pivots A A which pass through open links of the chain A A. Only occasional links of the chain are adapted to hold the cuttting bit. The other links being merely ordinary block links like the base of the bit holding link al ternating with open side links as shown.

The bit holding link has a hollow block B projecting laterally therefrom made up of a stirrup like part B through which passes the cutting bit B I B is a seat or chamber ad acent'thest1rmp 13 adapted to contain a locking wedge B. This locking wedge B is adapted to engage the under side of the bit B and to be thrust thereagainst by the set screw B as itslides along the floor B. This wedge is held loosely in the socket by a pin lit which is free to, slide in the latteral slots B, but

which holds the wedge against withdrawal from the seat.

The back end of the wedge is provided with an overhanging semicircular flange member C adapted t engage a groove (3 in the (end of the setscrew, the relation of the parts being such that when the set screw is set in the wedge it is moved forward to clamp the bit and when the set screw is rotated in the opposite direction to draw it out, first the pressure on the wedge is released and then the enlarged end of the set screw engages the flange and draws the wedge away from its locking position. This leaves the bit unsupported on its lower side so that it can drop down, be loosely held in the stirrup, and be easier disengaged.

The importance of this, is, that if the wedge is forced into place and then left there, coal dust and the like will be packed in about the wedge looking it in position and then when the operator comes to release the pressure on the wedge in the hope of withdrawal the bit will still be wedged or locked in place, and he will have to knock the bit loose. He would, of course prefer to knock the wedge loose and not knock on the delicate and expensive tempered bit, but the wedge is buried inside the link and the operator can do nothing but try to knock the It will be evident, while I have shown; in

the drawings an operative device, still many changes might be made both in shape and arrangement of parts without departing from the spirit of my invention, and I wish, therefore, that my drawings be taken in a sense diagrammatically. 7

I claim- L 1. A bit holding link for coal cutting chains and the like comprising a. link member adapted to be a part of a cutting chain,

means for positively fastening the bit in posit-ion therein, comprisin a bit engaging member and a set screw a apted to thrust it toward the bit, and a connection between the set screw and engaging member whereby withdrawal of the set screw moves thebit holding member away from the bit.

2. A bit holding link .for coal cutting chains and-the like comprising a link member adapted to be a part of a cutting chain,

means for'rigidly fastening the bit in position therein, comprising a bit engaging member and a set screw adapted to thrust it toward the bit, and a connection between the set screw and engaging member whereby withdrawal of the set screw moves the bit beradapted to be a part of a cutting chain,

A means for holdin means for rigidly fastening the bit in position therein, comprising a wedge, means for holding it against movement out of line with the line of action of the clamping means while permitting free movement along'sueh line. I

4. A bit holding link for coal cutt ng chains and the like comprising a link member adapted to be a part of a cutting chain, means. for rigidly fastening the bit in posltion therein, comprising a bit engaging member, a'set screw adapted to thrust it toward thebit, and a connection between the set screw and engaging member whereby withdrawal of the set screw moves the bit holding member away from the bit, the bit engaging" member comprising a wedge, it against movement out of line with the line of action of the clamping means while permitting free movement along such line.

5. A: bi holding link for coal cutting chains and the like comprising a link, member adapted to be a part of a cutting chain,

means for rigidly fastening the bit in posi .tion therein, comprising a bit engagin member, a set screw adapted to thrust 1t toward the bit, and a connection between the set screw and engaging member whereb withdrawal ofthe set screw moves the b t holding member away from the bit, said connection comprising a group about the end of the set screw and aflange on the bit engaging member adapted to penetrate said of the clampin free movement a mug such line.

group, the bit engagmg member comprismovement out of line with the line of action means while permitting 6 A bit holding link for coal cutting chains and the like comprising a link bit adapted to form a part of the chain, an open stirrup carried thereby, an abutment adjacent said stirrup, a link adapted to engage said stirrup at one side, a wedge adapted to engage the link at the other side, a set screw, screw threaded in said abutment A and adapted to thrust the wedge against the b t, a groove about the end of theset screw,

afilange projecting from the wedge pene: tratmg said groove "whereby retraction of t eatre the set screw moves the wedge away from the bit and means for preventing movementof the wedge along any line excepta line parallel with the axis of the set screw.

7. A bit holding link for coal cutting chains and the like comprising a link member adapted to be a part of a cutting chain,

a bit receiving socket. mounted thereon,

means for positively fastening the bit in position therein, comprising a removable socket s1de member, a set screw adapted to thrust it toward the bit, and a connection. I 1

betweenthe set screw and the side member whereby withdrawal of the set screw draws the side member away from the bit and socket.

8. A bit holding link for coal cutting chains and the like comprising a link member adapted to be a part of a cutting chain, said member being provided with a socket. aperture adapted to receive a cutting bit and means for securing said bit in position. in the socket, comprising a movable socket walland positivemeansior forcing said socket wall directly against said bit and for socket'wall directly against said bit and for withdrawing said socket wall from contact with said bit, the axis of travel of said socket wall lying in the same vertical plane as the long axis of the bit.

10. A bit holding link for coal cutting chains. and the like, comprising a link member adapted to be a part of the cutting chain, a bit receiving socket mounted thereupon, means for securing the bit in position therein, comprising a removable side wall forthe socket and means for forcing it directly against the .bit, along an axis lying in the same plane as the axis of the mg a wedge means for holding 1t against b 11. A bit holding link for coal cutting:

chains and the like, comprising a link member adapted to be a part of the cutting chain, a bit receiving socket mounted thereon, means for securing the bit imposition therein, comprising a movable side wall for the socket and means for sliding it trans-.

versely away from the bit along a plane parallel with the bottom of the link; 4

12. A bit holding link for coal cutting chains and the like comprising a link memane the socket, and means for moving it transversely in relation to the bit.

13. A bit holding link for coal cutting chains and the like comprising a link member adapted to form part of a cutting chain, a fixed socket portion adapted to engage one corner of a bit of substantially square cross section, a socket member movable in relation thereto, adapted to engage an opposed corner of said bit, and positive means for moving it transversely in relation to said bit. a

14. A bit holding link for coal cutting chains and the like comprising a link member adapted to form part of a cutting chain, a fixed socket portion adapted to engage one corner of a bit of substantially square cross section, a socket member movable in relation thereto, adapted to engage an op posed corner of said bit, and positive means for moving it transversely in relation to said bit, said movable member comprising amllllock slidable along the bottom of the 1' grooved, bit engaging surface, the bit engaging surface of the fixed socket portion being inclined to over-hang and lie parallel with the inclined surface of said block.

Signed at Indianapolis, county of Marion and State of Indiana, this 1th day of December, 1919.

CHARLES N. BARTON.

and provided with an inclined, 

